Auto burglar alarm



D. B. SHELLER.

AUTO BURGLAR ALARM.

APPucATloN FILED ocr. 9, 1920.

1,41 8,' 1 77, Patented May so, 1922.

."illlllllllllllll y.durer DAVVID B. SHELLER, F TACOMA, WASHINGTON,

AU '10 BURGLAR ALARM.

To all whomit may concern: l' l A Be it known that I, DAVID B.Sr-IELLER, a

" citizen of the United States, residing at the cityof Tacoma, in thecounty of Pierce and State of l/Vashington, have'invented a new anduseful Auto Burglar Alarm, of which the following is a specification.

MyI invention relates to improvements in devices designed for soundingan alarm when an automobile or other motor driven vehicle is operated bya thief1 or other unauthorized person; and the objects of my inventionare, first, to provide and conceal a burglar alarm within the brake drumof an automobile or other motor driven vehicle; and second, to provide aconcealed device to be set bythe owner on leaving his automobile, andsaid device to sound an alarm when said automobile or truck is set inmotion by any unauthorized person.

l attain these objects by means of the device illustrated in theaccompanying drawingin which- Figure 1 is a section oi the brake drum ofan automobile on line 1-1, `Figure 2 and with a view to the right, andshows the device set in an inoperative position, and Fig. 2, is sectionof Fig. 1 on line 2-2 looking to the ri ht and showing a face view of mydevice. 4 igure 3 is the same as Fig. 1, and shows the device set in anoperative position, and Figure 4 is a left side view of the device as itappears complete when-detached from the brake drum.

Similar numerals refer to similar partsin the several views.

The brake drum of a motor driven vehicle usually consists of a shallowopen-faced drum bolted to the driving wheel, and made to, either fitinside or outside of asimilar open-faced kdrum xed on the housing axlein which the driving axle revolves. My invention is represented`attached within a brake drum 1 which is itted to revolve outside thehousing axle drum 2. The drums vary in dimension on different machines,and my invention is designed to vary in size to be suitably installed.

The brake drum 1 is fixed to the side oi the driving wheel or instance7to its hub or spokes (not. shown) by means of bolts 3, and will revolvewith the wheel. The inner drum 2 will be iixed to the usual housing ofthe axle and will be stationary; y

My invention comprises a device mounted on the inner 'face of drum 2 andhaving a `Specification of Letters Patent. i

Patented May 30,1922.

Application filed October 9, 1920. Serial No. 415,842,

spring actuated contactv with the bolt yhead 3. This will make a sharpclacking noise when used by an unauthorized person, that will attractattention and lead to the arrest of the offender. l

The device consists of a stout spring steel bar 4 pivotally mounted on astud atA 5. (lne end of the springsteelbar 4 is formed or slotted toreceive a disk cam 6 which is connected with the spring bar by a pin 7passing through aslot formed in the cam. The cam is mounted at 8 at theend of a stud 9 by means of a crank shaft 1() passing through stud 9 andprovided with al securing nut 11. The shaft 10 has at its other end acrank 12 which is operated by a rod 13 which will be extended to asuitable place in the vehicle where the owner only will have knowledgeand control of it. By this means the owner on parking or leaving his carcan set the alarm by operating the cam G to shift the spring bar 4 fromthe position shown in Fig. 1 to the position shown in Fig. 3. 1t will beobserved that the spring bar 4 has a V-shaped projection 14. ThisV-shaped projection 14 will clear the bolt nuts 3 when the spring bar 4is set as shown in Fig. 1, but when set as shown in Fig. 3 the springbar 4 and V-shaped projection 14 will contact with the bolt nuts` 3 asthe driving wheel turns and will make a clacking, rattling noise oralarm that will give notice that an unauthorized person is driving themachine. It will be observed that the spring bar 4 is outwardly bent atits free end 15 in order to cause it to ride over the bolt nuts 3,should the machine at any time be run backward.

The entire `mechanism ofthe device is mounted on the two studs or posts5 and 9.

These studs 5 and 9 are cast on a common base 16 which is suitablylocated on the inner face of drum 2 and fixed in place by the two bolts17, the holes for same being drilled through the face ofdrum 2.

My invention can be attached to the housing axle drum by removing thedriving wheel, locating and drilling the holes for bolts 17 and boltingthe base 16 with studs I 5 and 9 thereon in place. The spring bar 4 withoperating` cam 6 are then tted to their respective studs, the crankshaft 10 inserted and the nut 11 screwed on. The means for operatingcrank 12 through rod 13 is then completed, the driving wheel replacedand my newly invented device is then vready for service.

lt is to be observed that l do not limit myself to any exact Adetails orproportions, but reserve the right to vary the same Ito meet conditionsand dimensions required by different makes of automobiles and motorVehicles.

,Having described my invention, claim:

l. Anr auto-theft alarm, comprising in combination with a vehiclebrake-drum; a spring-bar pivotally mounted Within rthe brake-drum, arotatable cam-mounted Within the drum and formed with an arcuate slot,means connecting one endk ofthe pivoted spring bar with the slottedportion of the i' cam torpositively. throwing` the other end of bar intoand outof alarm-giving position, and means for rotating the cam to throwthe pivoted bar into and ont et thepath of studs attached to a rotatingportion ot the brakedrum to make and break contact With the studs. i 1

' 2. An auto-theft alarm, comprising,` in combination With aVehiclebrake-drum having ,one'member of the drum providedwith bolts forattachment to the vehicle Wheel to rotate therewith; av spring-barpivotallv` mountedpvvithin' the drum in position to have one end shiftedinto and ont of the path of the attachment bolts, a rotatable cammountedwithin the drum and having onelend` of the springjbarpositivelyconnected thereto for shifting the bar to bring,` it into and out ot thepathy of the attachment bolts, and means for rotatinof the cam.

3. An auto-thett alarm attachment for a vehicle brake-drum saidattac-hmentcomprising' a base member tori attachment to a one end of thespring bar with Athe cam, and

a shaft connected with the cam for rotating` it to throw thespringbarinto and out Qi. alarm-g1v1ng position.

DAviD B. sHELLnR.

